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Title: Comment on electron-impact excitation cross section measurements for He-like xenon

Abstract

We discuss lower-than-predicted collisional–excitation cross sections for helium-like xenon measured at an Electron Beam Ion Trap facility. In a review paper (H. Chen and P. Beiersdorfer. Can. J. Phys. 86, 55 (2008)), the authors find a critical effect due to the Breit interaction between the free and the bound electrons in the excitation process of He-like xenon. The authors state that the agreement between the measured and calculated cross section values can only be found when the generalized Breit interaction is included in the calculations. We have performed new calculations with a multi-configuration Dirac–Fock code, as well as with the Penn State University suite of codes, and our conclusions are that the contribution of the Breit interaction is much lower than found in the calculations presented in the abovementioned article. In fact, our predictions are subsequently almost twice as large as the experimental values. We propose these considerations in hopes of motivating new experimental investigations.

Authors:
 [1];  [1]; ORCiD logo [2]
  1. Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1525829
Report Number(s):
LA-UR-18-22340
Journal ID: ISSN 0008-4204
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Canadian Journal of Physics
Additional Journal Information:
Journal Volume: 97; Journal Issue: 5; Journal ID: ISSN 0008-4204
Publisher:
Canadian Science Publishing
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; atomic physics; electron-impact excitation; electron beam ion trap; multi-configuration Dirac–Fock; generalized Breit interaction

Citation Formats

Pain, Jean Christophe, Comet, Maxime, and Fontes, Christopher John. Comment on electron-impact excitation cross section measurements for He-like xenon. United States: N. p., 2019. Web. doi:10.1139/cjp-2018-0209.
Pain, Jean Christophe, Comet, Maxime, & Fontes, Christopher John. Comment on electron-impact excitation cross section measurements for He-like xenon. United States. doi:10.1139/cjp-2018-0209.
Pain, Jean Christophe, Comet, Maxime, and Fontes, Christopher John. Tue . "Comment on electron-impact excitation cross section measurements for He-like xenon". United States. doi:10.1139/cjp-2018-0209.
@article{osti_1525829,
title = {Comment on electron-impact excitation cross section measurements for He-like xenon},
author = {Pain, Jean Christophe and Comet, Maxime and Fontes, Christopher John},
abstractNote = {We discuss lower-than-predicted collisional–excitation cross sections for helium-like xenon measured at an Electron Beam Ion Trap facility. In a review paper (H. Chen and P. Beiersdorfer. Can. J. Phys. 86, 55 (2008)), the authors find a critical effect due to the Breit interaction between the free and the bound electrons in the excitation process of He-like xenon. The authors state that the agreement between the measured and calculated cross section values can only be found when the generalized Breit interaction is included in the calculations. We have performed new calculations with a multi-configuration Dirac–Fock code, as well as with the Penn State University suite of codes, and our conclusions are that the contribution of the Breit interaction is much lower than found in the calculations presented in the abovementioned article. In fact, our predictions are subsequently almost twice as large as the experimental values. We propose these considerations in hopes of motivating new experimental investigations.},
doi = {10.1139/cjp-2018-0209},
journal = {Canadian Journal of Physics},
number = 5,
volume = 97,
place = {United States},
year = {2019},
month = {4}
}

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